[resolved] Error message about not being able to modify header - can't login at all (4 posts)

Warning: Cannot modify header information - headers already sent by (output started at /home/content/65/9071965/html/wp-content/plugins/pinterest-pin-it-button/pinterest-pin-it-button.php:3) in /home/content/65/9071965/html/wp-login.php on line 368

Warning: Cannot modify header information - headers already sent by (output started at /home/content/65/9071965/html/wp-content/plugins/pinterest-pin-it-button/pinterest-pin-it-button.php:3) in /home/content/65/9071965/html/wp-login.php on line 380

Warning: Cannot modify header information - headers already sent by (output started at /home/content/65/9071965/html/wp-content/plugins/pinterest-pin-it-button/pinterest-pin-it-button.php:3) in /home/content/65/9071965/html/wp-includes/pluggable.php on line 680

Warning: Cannot modify header information - headers already sent by (output started at /home/content/65/9071965/html/wp-content/plugins/pinterest-pin-it-button/pinterest-pin-it-button.php:3) in /home/content/65/9071965/html/wp-includes/pluggable.php on line 681

Warning: Cannot modify header information - headers already sent by (output started at /home/content/65/9071965/html/wp-content/plugins/pinterest-pin-it-button/pinterest-pin-it-button.php:3) in /home/content/65/9071965/html/wp-includes/pluggable.php on line 682

Warning: Cannot modify header information - headers already sent by (output started at /home/content/65/9071965/html/wp-content/plugins/pinterest-pin-it-button/pinterest-pin-it-button.php:3) in /home/content/65/9071965/html/wp-includes/pluggable.php on line 876